Inspection Procedure

HINT:

Read freeze frame data using Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air/fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.

1. CHECK SPEEDOMETER (OPERATION) 
   1. Drive the vehicle and check if the operation of the speedometer in the combination meter is normal.

      HINT:

      The vehicle speed sensor is operating normally if the speedometer reading is normal.

      OK: 

      Speedometer operation is normal. 

   NG: CHECK SPEEDOMETER CIRCUIT 

   OK: Go to next step 

2. INSPECT ECM (SPD VOLTAGE) 
   1. Shift the transmission gear selector lever to the neutral position.
   2. Jack up the vehicle.
   3. Turn the ignition switch to the ON position.
   4. Check the voltage between the terminals of the E3 and E5 ECM connectors as the wheel is turned slowly.

      Standard voltage 

      TESTER CONNECTIONS AND SPECIFIED CONDITIONS
      
      

      Tester Connections	Specified Conditions
      SPD (E5-17) - E1 (E3-5)	Voltage generated intermittently

      Fig 1: Identifying E3 And E5 ECM Connectors Terminals

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      HINT:

      The output voltage should fluctuate up and down similarly to the diagram on the left when the wheel is turned slowly.

   NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

   OK: REPLACE ECM